Company lists · Data refreshed September 2026
Top 25 IT security managed services based in Denver, United States
RevenueBase identified 55 IT security managed services headquartered in Denver, United States as of September 2026 and tracks 872 professional contacts across them, including 494 with verified work emails. New York is the largest hub.
This list covers IT security managed services headquartered in Denver, United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 21, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest IT security managed services based in Denver, United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 408 contacts → | ||||
Indirect evidence “Red Canary stops cyber threats no one else does, so organizations can fearlessly pursue their missions.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 2 | 111 contacts → | ||||
Strong evidence “DirectDefense provides enterprise risk assessments, penetration testing, ICS/SCADA security services, and 24/7 managed security services for companies of all sizes.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 3 | 53 contacts → | ||||
Strong evidence “eCreek IT delivers managed IT services and cybersecurity solutions for small to mid-sized businesses across Denver and the Colorado Front Range.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 4 | 48 contacts → | ||||
Partial evidence “Accuvant is a leading provider of information security services and solutions serving enterprise-class organizations across North America.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 5 | 24 contacts → | ||||
Partial evidence “Most IT companies are great at one thing.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 6 | 21 contacts → | ||||
Indirect evidence “Analytics partners with companies to maximize the growth, success, and prosperity of their business.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 7 | 21 contacts → | ||||
Indirect evidence “Cyber Sainik protects organizations from contemporary, sophisticated threats by delivering enterprise-level tools, methods, procedures, and profound expertise, alongside…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 8 | 18 contacts → | ||||
Partial evidence “Alchemy Security is a boutique cybersecurity firm dedicated to giving organizations a Defender's Advantage through a suite of innovative products and services.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 9 | 13 contacts → | ||||
Partial evidence “Point Solutions Security was born from a belief that anything is possible when you step outside your comfort zone and push boundaries.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 10 | 12 contacts → | ||||
Indirect evidence “Computer Concepts Inc.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 11 | 11 contacts → | ||||
Partial evidence “Our team of dedicated technology experts is here to be a true partner in managing your technology infrastructure.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 12 | 10 contacts → | ||||
Partial evidence “NPF Networks is a computer networking and IT support company based out of Denver, Colorado.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 13 | 8 contacts → | ||||
Indirect evidence “Tickets don’t solve problems.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 14 | 8 contacts → | ||||
Strong evidence “Envision IT Partners, a division of Frontier Business Products, is a Colorado-based managed IT service provider with offices all along the Front Range.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 15 | 7 contacts → | ||||
Partial evidence “How do you feel about your organization's IT and cybersecurity?” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 16 | 7 contacts → | ||||
Strong evidence “Welcome to Netirio Managed IT Services and Consulting, where we're dedicated to reshaping the way businesses across the nation approach their technology needs, catering from SMBs…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 17 | 5 contacts → | ||||
Partial evidence “DevilDog specializes in making cybersecurity easy with complete customized security solutions from start to finish.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 18 | 5 contacts → | ||||
Indirect evidence “At PCG Systems, we help organizations across industry sectors bring bold strategies to life in unexpected ways.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 19 | 4 contacts → | ||||
Partial evidence “Culture of Awareness Security is more than the sum of its parts Some MSP’s work hard with the technical: Firewalls, patches, anti-virus, web filtering, Zero Trust, SEIM…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 20 | 4 contacts → | ||||
Strong evidence “TechnologyWest is a Colorado-based IT services provider delivering cybersecurity solutions, managed IT services, cloud infrastructure, networking, unified communications, and…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 21 | 4 contacts → | ||||
Indirect evidence “Thunder Rock is a technology company that is dedicated to making sure your business can function optimally and efficiently while reducing waste.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 22 | 4 contacts → | ||||
Partial evidence “At Cypress Data Defense, our goal is to help organizations secure their IT and Application Development Operations using a pragmatic, risk-based approach.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 23 | 4 contacts → | ||||
Indirect evidence “Is your team losing precious minutes (or hours) with computers being down- Do you know what you would do if your company was attacked by an email phishing scam and all your data…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 24 | 4 contacts → | ||||
Strong evidence “ITGuys Team – Your Trusted Nationwide IT Partner Founded in 2009 in Denver, Colorado, ITGuys Team is a leading Managed IT Services Provider (MSP) delivering secure, scalable…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 25 | 3 contacts → | ||||
Indirect evidence “Galileo Systems Group is a premiere technology solutions provider (TSP) focusing on small to medium sized businesses (SMBs).” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: IT security managed services. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names IT security managed services.
- Partial evidence
- Its own public description names part of IT security managed services, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name IT security managed services. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
Showing 25 of 55 IT security managed services based in Denver, United States
See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 494 reachable decision-makers.
Free signup · no credit card
IT security managed services based in Denver, United States at a glance
As of Sep 21, 2026Companies by employee count
Email recency for this list is measured across the whole United States list rather than for Denver, so it is reported there. Company counts and contact totals on this page are exact for Denver, over 55 companies.
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among IT security managed services, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in Denver, United States whose own description of what they do matches “IT security managed services”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names IT security managed services), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among IT security managed services, and records with no verified work email. Companies headquartered outside Denver are excluded even when they keep an office there.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every listed company carries at least one verified work email, 494 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 21, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
IT security managed services by metro in the United States
- IT security managed services in New York230
- IT security managed services in Houston163
- IT security managed services in Austin114
- IT security managed services in Miami108
- IT security managed services in Dallas104
- IT security managed services in Chicago93
- IT security managed services in Atlanta89
- IT security managed services in San Diego76
- IT security managed services in Tampa75
- IT security managed services in San Francisco70
- IT security managed services in Los Angeles69
- IT security managed services in Charlotte61
- IT security managed services in Las Vegas58
- IT security managed services in Phoenix58
- IT security managed services in Washington56
- IT security managed services in Denver55
- IT security managed services in Irvine52
- IT security managed services in San Antonio51
- IT security managed services in Boston39
- IT security managed services in Orlando38
- IT security managed services in Portland37
- IT security managed services in Wilmington37
- IT security managed services in San Jose36
- IT security managed services in Columbia35
- IT security managed services in Cincinnati34
- IT security managed services in Scottsdale33
- IT security managed services in Seattle32
- IT security managed services in Arlington31
- IT security managed services in Fort Lauderdale31
- IT security managed services in Plano30
- IT security managed services in Alexandria28
- IT security managed services in Jacksonville28
- IT security managed services in Nashville28
- IT security managed services in Pittsburgh28
- IT security managed services in Raleigh28
- IT security managed services in Indianapolis27
- IT security managed services in Columbus26
- IT security managed services in Louisville26
- IT security managed services in Sheridan26
- IT security managed services in Frisco25
- IT security managed services in Richmond25
Frequently asked
What is RevenueBase Smart Search?
RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names IT security managed services, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.
How many IT security managed services are there based in Denver, United States?
RevenueBase identified 55 IT security managed services headquartered in Denver, United States as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
RED Canary, A Zscaler Company, headquartered in Denver, tops this list with the largest team on record.
Which city has the most IT security managed services?
New York leads with 230 headquartered companies, followed by Houston (163) and Austin (114).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 494 verified decision-maker contacts tracked across these 55 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 21, 2026.
Ready to reach these companies? Verified emails and direct dials for all 55 IT security managed services based in Denver, United States. Start with a free account, no credit card.
Download this list →Related lists
IT security managed services by geography
- IT security managed services based in Brisbane, Australia
- IT security managed services based in Melbourne, Australia
- IT security managed services based in Sydney, Australia
- IT security managed services based in Belo Horizonte, Brazil
- IT security managed services based in Curitiba, Brazil
- IT security managed services based in Rio De Janeiro, Brazil
- IT security managed services based in Sao Paulo, Brazil
- IT security managed services based in Calgary, Canada
- IT security managed services based in Edmonton, Canada
- IT security managed services based in Mississauga, Canada
- IT security managed services based in Montreal, Canada
- IT security managed services based in Ottawa, Canada
About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.
More company lists
- All company lists
- Lists by location
- Lists A-Z
- New lists
- IT security managed services based in Brisbane, Australia
- IT security managed services based in Melbourne, Australia
- IT security managed services based in Sydney, Australia
- IT security managed services based in Belo Horizonte, Brazil
- IT security managed services based in Curitiba, Brazil
- IT security managed services based in Rio De Janeiro, Brazil